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3.
A women who has passed her prime
"Hey John, is your new secratary hot?"

"No, she is a little long in the tooth."
by John McDonough November 18, 2003
 
1.
(adj.) Old, outdated. no longer to perform its primary function at optimum level.
The playstation one is a bit long in the tooth these days.
by Kung-Fu Jesus June 07, 2004
 
2.
old, advanced in age(from the practice of judging a horse's age by the length of it's teeth)
The plumbing is a bit long in the tooth. It needs to be replaced.
by The Return of Light Joker January 21, 2010